I have a sister that crochets at every available opportunity - her specialty being dolls and doll clothing and her creations are very well received, so much so that over the years she has sold literally thousands of items (long before the days of Etsy and Ebay). When visiting her home she always has a collection of finished crochet items boxed away as a sort of personal savings plan, available for sale when an influx of cash is needed quickly. Over the years she has experimented with tons of different types of crochet projects, but found her niche and has prospered from it considerably.
In her own way she has utilized her crocheting skills as a cottage industry, working when she wants and adjusting her participation in crafts as life allows.
Many others are doing this also, and sadly many are spinning their wheels and failing miserably.
After much thought it becomes clear that there are a few basic reasons that many who enjoy the art of crochet are unable to sell their creations with any measure of real success. After long consideration it all comes back to dual points of contention and that is to make items for sale that are unique and are extremely well made.
A crocheter can make dozens of assorted items in various styles, and if they are sloppily made there will be no sale. The same applies to attempting to sell items that any 12 year old with a crochet hook can crank out in volume, again no sale.
Crochet items that have any hope of being sold need to possess a "Wow Factor" and discovering just which projects to make and of these which you possess the skill to make flawlessly can be a long process for sure.
Just another fan of free crochet patterns of all types and styles looking to share the gifts of those that are creative and kind.